Abstract
was achieved around pH 6, whereas increasing sorbent mass from
10g/L to 200 g/L enhanced colour reduction from 25% to 86% at 298
K. Spontaneity of the process was suggested by negative Gibbs free
energy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of error
functions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash had
maximum sorption capacity of 53 mg/g and could thus be used as a
low cost adsorbent in melanoidin removal.
| Original language | English |
|---|---|
| Pages (from-to) | 17-23 |
| Number of pages | 7 |
| Journal | International Journal of Civil and Environmental Engineering |
| Volume | 2 |
| Issue number | 1 |
| Publication status | Published - 2010 |
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Decolourization of melanoidin containing wastewater using South African coal fly ash. / Ojijo, Vincent O; Onyango, Maurice S.; Ochieng, Aoyi; Otieno, Fred.
In: International Journal of Civil and Environmental Engineering, Vol. 2, No. 1, 2010, p. 17-23.Research output: Contribution to journal › Article
TY - JOUR
T1 - Decolourization of melanoidin containing wastewater using South African coal fly ash
AU - Ojijo, Vincent O
AU - Onyango, Maurice S.
AU - Ochieng, Aoyi
AU - Otieno, Fred
PY - 2010
Y1 - 2010
N2 - Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m²/g and pore volume of 0.002245cm³/g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removalwas achieved around pH 6, whereas increasing sorbent mass from10g/L to 200 g/L enhanced colour reduction from 25% to 86% at 298K. Spontaneity of the process was suggested by negative Gibbs freeenergy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of errorfunctions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash hadmaximum sorption capacity of 53 mg/g and could thus be used as alow cost adsorbent in melanoidin removal.
AB - Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m²/g and pore volume of 0.002245cm³/g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removalwas achieved around pH 6, whereas increasing sorbent mass from10g/L to 200 g/L enhanced colour reduction from 25% to 86% at 298K. Spontaneity of the process was suggested by negative Gibbs freeenergy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of errorfunctions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash hadmaximum sorption capacity of 53 mg/g and could thus be used as alow cost adsorbent in melanoidin removal.
M3 - Article
VL - 2
SP - 17
EP - 23
JO - International Journal of Civil and Environmental Engineering
JF - International Journal of Civil and Environmental Engineering
SN - 2077-1258
IS - 1
ER -